Show HN: Nextprev.it: Share PDFs & control what page the viewer sees in realtime

We just launched Nextprev.it — A project we put together over a couple of days.<p>The project stemmed from a frustration with PDF file transfers and screen-sharing when giving design presentations to clients through Skype.<p>Please give it a go and let us know what you think - @nextprev<p>Any feedback is greatly appreciated!